Package org.apache.flink.table.types.inference

Class SystemTypeInference

java.lang.Object

org.apache.flink.table.types.inference.SystemTypeInference

@Internal
public class SystemTypeInference
extends Object

Extends the TypeInference function-aware by additional system columns and validation.

During planning system columns are available and can be accessed in SQL, during runtime those columns are not passed or returned by the eval() method. They are handled with custom code paths.

For example, for ProcessTableFunction, this utility class implicitly adds the optional uid and on_time args and an additional rowtime column in the output. Additionally, it adds a validation layer for complex StaticArguments.

Constructor Summary

Constructors

Constructor	Description
SystemTypeInference()

Method Summary

Modifier and Type	Method	Description
static TypeInference	of(FunctionKind functionKind, TypeInference origin)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SystemTypeInference

public SystemTypeInference()

Method Details

of

public static TypeInference of(FunctionKind functionKind,
 TypeInference origin)